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What about a prime-zip then? You just need the offset and length of any sequence of numbers.

Also as impractical as this one

That is not the same.

This is just "easier to compress text if we have a humungous DB to reference from". Drawing digits out of mathematical sequences (like digits of pi or whatever) is a net loss since it will take more bits to point at the correct place than the input data to begin with, apart from the computational cost.